# Questions Asked onMay 25, 2010

1. ## geometry

How do I find the surface area of a sphere with a radius of 8cm?

2. ## statistics

if Z is a standard normal variable, find the probability. the probability that z lies between -2.41 and 0

3. ## physics - leg cast

The leg and cast in the figure below weigh 280 N, with the center of mass as indicated by the blue arrow in the diagram. The counterbalance w1 weighs 105 N. Determine the weight w2 and the angle α needed so that no force is exerted on the hip joint by the

4. ## Chemistry

Is Glucose soluble in HCl, NaOH and NaHCO3 because it's soluble in water? - I put soluble for all because it dissolves in water. Is p-toluidine soluble in HCl, NaOH, and NaHCO3? I put soluble in HCl, insoluble in NaOH and insoluble in NaHCO3. Is benzoic

5. ## Corporate Finance

Electronic Timing Inc (ETI) is a small company founded 15 years ago by electronic engineers Tom Miller and Jessica Kerr. EIT manufactures integrated circuits to capitalize on the complex nixed-signal design technology and has recently entered the market

6. ## Physics

A skier of mass 64 kg starts from rest at the top of an 18° slope, points her skis straight down the slope and lets gravity pull her down the slope. The slope is 65 m long. Her speed at the bottom is 15 m/s. (a) Assuming zero air resistance, what is the

7. ## algebra 2

find the sum of the first 24 terms of the arithmetic sequence, if the first term is 3 and the commom difference is 3.

8. ## Math

What is the product of a multiplication sentence?

9. ## chemistry

How are the formation of aqueous solutions of sodium chloride and sucrose similar?

10. ## Physics

What causes the restoring force in a simple pendulum? A. friction between the thread and the support B. the force exerted on the pendulum bob while displacing it from the mean position C. the component of the weight of the bob acting perpendicular to the

11. ## Health

what are the disadvantages of using master patient indexs(MPI)? both manual MPI and automated MPI

12. ## Honors Chemistry

If the percent (mass/mass) for a solute is 20% and the mass of the solution is 300 g, what is the mass of the solute in solution?

13. ## English

Give four characteristics of standard English.

14. ## algebra 2

you own 9 sweaters and are taking 3 on vacation. In how many ways can you choose 3 sweaters from the 9?

15. ## Math Analysis

Can someone help me with this problem, please? Thanks!! "A ship leaves port and sails for 2 hours northeast and then 3 hours northwest. If the speed remains constant, what course should the ship take home?"

16. ## Chemistry

I have a balloon that contains 22 grams of Carbon dioxide. The barometric pressure is 1019 millibars which I converted to 1.006 Atm and the temperature is 299 "K". What is the volume of balloon? I used the ideal gas law to find out the volume in liters of

17. ## English

In Romeo and Juliet, why did Romeo choose poison instead of a dagger on himself when he found out that Juilet was "dead"? I can figure out that money was what poisoned the Capulets and Montagues. So he would like to buy poison from the apothecary even if

18. ## Algebra 2

solve one ninth = 27^3x-5.

19. ## English

How ofen do you read the newspaper? I read it every day. (Does the answer mean 'I read the same newspaper every day,' or 'I read a newspaper every day.' Was 'the newspaper' writen in generic use or not?)

20. ## biology

how is emigration and immigration not important factors when studying global human population growth?

21. ## Chem

Can someone explain how to do this problem? For the equilibrium reation below, 288g of liquid water and 448 g of carbon monoxide are placed in an 8.00 liter container and heated to 900 K. If the value of K_c for the reaction at 900 K is 1.56, what are the

22. ## Math

Can scalene triangles ever be similar?

23. ## college chemistry

How much heat is needed to convert 2.00 kg of liquid ammonia at -40.0 oC to its vapor at -11.0 oC? The specific heat of liquid ammonia, NH3 (l), is 4.70 J/g-K and that of the vapor NH3 (g), is 2.20 J/g-K. The enthalpy of vaporization of ammonia is 23.3

24. ## math

EF is a median of isosceles trapezoid ABCD. Find EF if AB is equal to 3 inches, and CD is equal to 11 inches.

in the story the dog of Pompeii. The questions says the author muses that tito becomes a famous friend to and healer of animals. How is that idea an extension of the storys theme?

26. ## Math

How do i solve this system algebraicly? 3x + 8y = 16 5x + 10y = 25

27. ## science

whatis the mass of a electromanetic roller coaster?the weight?

28. ## Algebra II

An investment service promises to triple your money in 12 years. Assuming continuous compounding of interest, what rate of interest is needed? For the question is it asking me if simple interest or continuously compounded interest is needed? Or Is it

29. ## math

The length of a rectangle is 7 cm more than its width. The area of the rectangle is 120 sq. cm. What is the width of the rectangle?

30. ## geometry

if the measure of one angle of an isosceles triangle is 92 degrees. what is the measure of either of remaining angles

31. ## Chem Help

What is the heat of reaction when 4 moles of carbon monnozide are buened in oxygen?

32. ## Calculus

Resolve the vector v=[7,9] into rectangular components, one of which is in the direction of u=[6,2].

33. ## economics

When the market price is above equilibrium price, the market price will be drive

34. ## Chem

Is sodium benzoate soluble in HCl? I put yes What about NaOH? It's supposed to be created from a reaction with benzoic acid and NaOH What about NaHCO3? And aq. sodium benzoate plus HCl? And aq. sodium benzoate plus NaOH?

35. ## Algebra 2

Susan keeps track of the number of tickets sold for each play presented at The Community Theater. Within how many standard deviations of the mean do all the values fall? 137, 134, 91, 61, 150, 155, 110, 148, 90, 169, 67, 61 * 5 * 4 * 2 * 3

36. ## Chemistry

Describe how you would prepare 500 mL of a 0.0400 M solution of HCI from a concentrated soultion of HCI which is 36.5% HCI and has a density of 1.10 g/mL.

37. ## algebra

I just need to know if my work is correct. I am working in Excel and I need to find the formula for the expense Wages. I am not sure if wages consists of the gross pay or the net pay. Does anyone have any suggestions what it might be? I was thinking it

38. ## Chemistry

What is the pH of a 2.62 x 10^-1 HCN solution? The pKa for HCN = 9.212 I don't know whether to use the Henderson Hasselbalch Equation or just convert pKa to Ka and work it out that way.

39. ## English

We sat _________ the campfire. (Would you let me know suitable expressions for the blank?)

40. ## algebra

4-2y=7y+13 then y =?

41. ## ART - Carmen

About the thimble you described, please look at the maker's mark on the right: http://home.comcast.net/~brl/thimbles/stern.jpg Sra

42. ## ART

I have a 14k thimble with a SC mark inside a rectangle and a anchor next to it. Does anybody knows about this markings? I'll appreciate if you give me some info. Thank you.

43. ## high school

How did the defeat of the spanish armada by england in 1588 enable other european nations to build their new empires in the new world?

44. ## Math

FiberType HighCalorie LowCalori Totals High Fiber 18 4 22 Medium Fiber 23 6 29 Low Fiber 12 21 33 Totals 53 31 84 3. What is the probability that a cereal would both high calorie and high fiber? In other words, what is P(high calorie and high fiber)? 4.

45. ## Science

Winds in the Northern Hemisphere curve to the right and winds in the Southern Hemisphere curve to the left. This is known as the a. Jet Stream b. Wind c. Weather Pattern d. Coriolis Effect

46. ## math

How do I do this 4x +3= 2x+11

47. ## math

Write a word using capital letters. Your word needs to have 5 acute,2obtuse, and 5 right angles

48. ## math

A certain number changes from 200 to 900 within three hours find the vaulue of k using the formula n times e raised to k times t

x/2-1/3=5

50. ## chemistry

identify the oxidizing agent and the reducing agent in the following reaction: C + 2Clsub2 > CClsub4

51. ## MGT/216

I need a historical example of an ethical dilemma that deals with global business. All examples appreciated!?

52. ## geography

Where areas are heavily populated around the world and why? can you help me please? thank you

53. ## algebra 2

a rectangle has an area of ( x3+x2-10x+8) square meters, and a width of (x+4) meters. Find its length.

54. ## Chemistry

I have no idea what to do here.... What is the pH for the solution made from 11.10 mL of 0.2780 M NaOH solution mixed with 70.20 mL of 0.1300 M ammonium chloride solution? Note that the pKa for NH4+ is 9.241

55. ## Math

Given the functions f and g below, what is (f o g)(11)? f(x) = x − 20 g(x) = (x − 3)2

56. ## math

500 acres of land costs 800 dollars and every year there is a three percent increase in price then it gives the end cost was one thousand. it asks for the equation using v=p(1+r) raised to the n power

57. ## WRITING

Some say that texting on a cell phone is a bad thing for students focus, but their is a simple thing we can do is by having the teachers go around the classroom to see if students are texting. how can i fix this run-on sentence

58. ## math

a train is moving at 40km/hr and rain is falling at 10km/hr find velocity of rain relative to train

59. ## mat/116

-4 -3y>11

Identify parts of Speech for sentence below, on numbered word: 1 2 3 Before the eruption, Mount St.Helena was 4 like a giant pressure cooker.

61. ## Micro Economics

Externalities are third party consequence of some other action. They can be positive or negative externalities and they impose a benefit or cost to a third party. Identify a positive and a negative externality. Discuss the benefits and costs associated

62. ## Chemistry

If you have 100 L of methane gas how many liters of carbon dioxide can you produce when you burn the gas?

63. ## finance

Kim and Dan Bergholt are both government workers. They are considering purchasing a home in the Washington D.C. area for about \$280,000. They estimate monthly expenses for utilities at \$220, maintenance at \$100, property taxes at \$380, and home insurance

64. ## tci college

A brick undergoes a free fall from rest. Its initial height is 125 m above the ground. How long does it take to hit the ground? What is its maximum velocity before it makes impact? For ease of calculations, the magnitude of the acceleration of gravity is

65. ## algebra

Radical and Rational Exponent find roots square roots of 12a^3/25=6a^3 -3-square roots 18/-6=-1 check this for me it find the roots of the problem.

66. ## algebra

Radical and Rational Exponent find roots square roots of 12a^3/25=6a^3 -3-square roots 18/-6=-1 check this for me it find the roots of the problem.

67. ## English

Can you help me check these sentences, please? Thank you very much in advance. 1) The new factor in the Canterbury Tales is that there is individualization (?) . THe character exists because he has reactions and is in movement. 2) His individualization (?)

68. ## math

write a number pattern for 8 starfish if each of them have 5 arms.

69. ## college

In 1990, the life expectancy of males in a certain country was 62.1 years, it was 65.3 years. Let E represent life expectancy in year T and let t represent the number of years since 1990.

70. ## carpentry

if the radious of the circle 14 feet 7 inches and the height 22 ft 4 in what the voulme of 72 arc

71. ## math word problem

I have no clue as to how to tackle this problem. Two standard six-sided dice are rolled. The product of their outcomes is computed. Which of the following numbers is most likely to occur? 4 6 7 8

72. ## English

how many different ways can a play be staged?

73. ## Computer Science

What do you understand by life cycle of software development? Explain briefly the various stages of software development life-cycle.

74. ## math

In 1990, the life expectancy of males in a certain country was 62.1 years, it was 65.3 years. Let E represent life expectancy in year T and let t represent the number of years since 1990. E(t)= [ ]t+[] use the function to predict the life expectancy of

75. ## Computer Science

What do you understand by life cycle of software development? Explain briefly the various stages of software development life-cycle.

76. ## english

why is is "better late than never," rather than "better late then never?"

77. ## Computer Science

What do you understand by life cycle of software development? Explain briefly the various stages of software development life-cycle.

78. ## Math

The probability that a school bus is late is 0.04. How many times would you expect the bus to be late in a 5-week period?

79. ## Masters level finance

I am having a problem figuring out this problem. I understand the concept of depreciation and it occurs on non cash items over a period of time. However, there are no cash items to depreciate in this problem. Given the following information for O'Hara

80. ## math

Given the midpoint (8,14) and endpoint (-9,-1), find the other endpoint

81. ## Cost Accounting

What are the differences between a direct cost and an indirect cost? Which is the more difficult cost to track? Why? How do indirect costs affect the cost of a product? Should indirect costs be included in product cost? Why or why not?

82. ## Cost Accounting

What are the differences between job-cost and process-cost systems? When would it be appropriate to use each type of system? How does each system affect the cost of a product?

83. ## Chemistry

Approximately 1.5 10-3 g of iron(II) hydroxide, Fe(OH)2(s) dissolves per liter of water at 18°C. Calculate Ksp for Fe(OH)2(s) at this temperature. This is what I've done: 1.5x10^-3 g Fe(OH)2/L x 1mol Fe(OH)2/89.863g Fe(OH)2 = 1.669x10^-5 M Fe(OH)2 Fe(OH)2

can you please explain this question to me for part b i get t=0.7 by trial and error and 0.6 percent of the population but im sure theres a more exact way to do it (a) A chemical process produces NaCI at the rate 3.Jtgrams per minute. (i) What is the rate

85. ## East hem.

When did Rome become a republic?

86. ## college algebra

3y^2+8=0 (3y+2)+(3y-2)=8+0 3y=-8 y=3/8 Radical and Rational Exponent this chapter is hard for me.

87. ## poetry

i need help on thinking of a acrostic poem for DOLPHIN.

88. ## science

what is an element, a compound and a mixture ?

89. ## College Chemistry

For my homework I got this problem that my professor never went over in class how to do it and I don't know how to interpret it. A chemist runs a second order reaction of A->B starting at 10mili moles/L concentration of A (and no B). After one hour the

90. ## English

Thank you very much for your help. I still have problems with a few sentence. I hope you can have a look at them too. 1)Can't I switch from the present to the past if I want to refer to a historical event? 2) Do not use contracter forms when writing your

91. ## chemistry

what is the sorce of van der waals forces?

92. ## Math

Restriction on variable in a denominator If the expression - 9t+1/ -5t +7

93. ## chemistry

Why must a balanced chemical equation be used when determining Keq?

the story the dog pompeii the author uses much of the story to describe the wealth and beauty of Pompeii. the story ends with scientists amazed at finding an ordinary dog with a raisin cake. How do these two different story elements relate to the theme?

95. ## college algebra

Radical and Rational Exponent find roots square roots of 12a^3/25=6a^3 -3-square roots 18/-6=-1 this is my answer am I right. check this for me it find the roots of the problem

96. ## Math

Which of the following is an example of a ratio? number of dogs who like Good boy treats number of chocalates per bag number of people who like math all of the above Please help

97. ## algebra

-3square root 18 over-6= -1 Radical and Rational exponent check this for me please see if it right.

y=6-2x 7x-y=3

99. ## science

How can an animals structure help survive in different environments? give three examples

100. ## math

square root of x+4-2square x-1=-1 could help me please.

101. ## Macro economics

1)Robert received a \$100 gift certificate to a bookstore a year ago. The economy has been in an inflationary period for the last year. This gift certificate is A. not expressed in either real or nominal terms since it is not money. B. adjusted in terms of

102. ## english

how do i express sighing by using punctuations instead of using the word "sigh", or is there any other way to do it beside punctuation

103. ## economics

1)Robert received a \$100 gift certificate to a bookstore a year ago. The economy has been in an inflationary period for the last year. This gift certificate is A. not expressed in either real or nominal terms since it is not money. B. adjusted in terms of

104. ## physics

You are pushing a 55 N lawnmower across the the yard. Its handle makes a 55 degree angle with the ground. What force are you exerting on the handle?

105. ## chemistry!

an aqueous solution of calcium chloride boils at 101.3 degrees Celsius. How many kilograms of calcium chloride were dissolved in 1000.0 g of the solvent??

106. ## math

Shantel and Kwamie are planning to buy their first home

107. ## math

how do you solve these 1. 7d-2+5=20 2. 4x-10x=28 3. -4x-10x+28 4. 8y-3y+6= -10 5. 9+4w-6=12 6. 9w+4-6=12 7.18m-6-m=-16 8. -6r-r-13=-18

108. ## math

Given the functions f and g below, what is (f o g)(11)? f(x) = x − 20 g(x) = (x − 3)2

109. ## math

Two cards are randomly drawn from a standard deck without replacing the card after the first draw. Find the probability of drawing a spade followed by a heart. Please type your answer as a fraction. Do not forget to reduce if needed!

110. ## geography / 8 grade

Recentely, Russian troops fought which rebellions ethnic group ? The soviet Union . correct?

111. ## chemistry

What effect does bending, stress, or machining have on the tendency of iron to corrode?

112. ## chemistry

How does (a) copper and (b) zinc affect the corrosion rate of iron? How could this knowledge about iron and corrosion help you as a consumer or home owner?

113. ## Math

Paul is 12. His father is 33. How many years ago was the father 4 times as old as the son?

114. ## science

s it possible for seismologist to know for sure that an earthquake or volcanic eruption will not occur in a particular area? And why

115. ## Vectors

Could you please help me solve this question: Solve this system of equations using elementary operations. 1. x/3 + y/4 + z/5 =14 2. x/4 + y/5 + z/3 =-21 3. x/5 + y/3 + z/4 =7 So far, I have multiplied all three equations by 60, to turn them into whole

116. ## chemistry

What is the concentration of OH– ions formed when 40.0 g of NaOH is dissolved in 250 mL H2O?

117. ## criminal law/ college

I need to identify the bail sytem beneficiaries and what are some recommendations for the future of the bail system

118. ## physics

for both of these object system1: earth and ball if a ball is falling down, is the work done on it positive since force and displacement are in the same direction. system 2: earth and basket a basket is tied to a rope and is dropped then come to a full

119. ## Math

Given A=(1/2)(h)(a+b) Find: a. A if h=25, a=15, b=42 b. h if A=260, a=8, b=5 c. a if A=322, h=14, b=15 d. b if A=448, h=16, a=25 This makes no sense to me whatsoever. Please clarify as to what I'm supposed to do? Thank you very much!

120. ## chemistry

how many liters of hydrogen gas measured at 1.05 atm and negative 25 degrees will be produced when 5.00 grams of magnesium metal is dropped into excess hydrochloric acid?

121. ## chem

Calculate the boiling point elevation of a solution containing 50.0 g of glucose dissolved in 500.0 g of water? We just started learning about this and i don't get it!

122. ## economic

1)Robert received a \$100 gift certificate to a bookstore a year ago. The economy has been in an inflationary period for the last year. This gift certificate is A. not expressed in either real or nominal terms since it is not money. B. adjusted in terms of

123. ## math

1.15j-10+8=11 2. 18m-6-m=-16 3.18m-6m-1=-16

124. ## chemistry

what volume of O2 at STP is needed to react with 4.52 g of K

125. ## algebra 2

Mildred sold magazine subscriptions with three prices: \$22, \$18, and \$15. She sold 2 fewer of the \$22 subscriptions than of the \$18 subscriptions and sold a total of 33 subscriptions. If her total sales amounted to \$591, how many \$15 subscriptions did

126. ## world history

what nation became an imperial power in east asia

127. ## economics

1)Robert received a \$100 gift certificate to a bookstore a year ago. The economy has been in an inflationary period for the last year. This gift certificate is A. not expressed in either real or nominal terms since it is not money. B. adjusted in terms of

128. ## Math

solve this system algebraicly a- 2/3b =4 3/5a +b=15

129. ## algebra 2

Graph f(x)= 1/5x+3.

130. ## writing skills 1

what is the name of the common error in the sentences

131. ## math

are my answers right 1.8y-3-6=-10 x=-1 5/8 2. 7d-2+5=20 d=2 3/7

132. ## physics

if a piston is insulated and being pushed, is the temperature increased

133. ## algebra

square roots 12a^3/25 equal what it radical and rational exponent

134. ## chemistry

what is the molarity of a solution, if 12.0 g of KCl is dissolved into 500mL of H20

135. ## physics

if the system is a basket, the basket is tied to a rope and it is stopped by a fixed clamp when it is falling down, I know there is initial KE but how come initial work is negative. Isnt force and displacement are in the same direction, so work should be

136. ## math

can you please explain this question to me for part b i get t=0.7 by trial and error and 86 percent of the population but im sure theres a more exact way to do it (a) A chemical process produces NaCI at the rate 3t^1/2 grams per minute. (i) What is the

137. ## To Ms. Sue

Ms. Sue this is the A-Z story which I have been working on a few days ago. Finally it has been completed, and I would like you to edit it for me. I think that I have started it out well, but my ending bits are weird. I'll appreciate all the help you could

in a piston is locked in place and the cylinder is placed in a boiling water, the temperature, pressure, internal energy are all increase if a piston is being pushed inward, would it have the same answer as above

139. ## English

why does Harper Lee use humorous tone in to kill a mokingbird

140. ## History

- The ways in which states around the globe have related to each other during various periods and the issues that have shaped their interactions. I need 4 specific events, at t 1 of which must come from the period prior to 1700, t one must come from

141. ## Science

What is the pH of a 2.62 x 10^-2 M HBr solution? thanks

142. ## algebra 2

Eleven people are entered in a race. If there are no ties, in how many ways can the first two places come out?

143. ## consumer math

Tina earns \$14,500 per year. If she has 20% withheld for deductions, what is the net amount of her biweekly paycheck? a. \$2,900 b. \$669.23 c. \$111.54 d. \$446.15

144. ## Math

Unscramble A N I L T O R V P S R P I N R O O T O G I F L A O T R N L O N V I G S E I C N A T S D

145. ## algebra 2

Write a polynomial function that has the zeros 2, -2, and -1 and has a leading coefficient of 1. Then graph the function to show that 2, -2, and -1 are solutions.

Mr. and Mrs. Sawyer bought a condonminium for \$75,000. Assuming that it value will appreciate 6% a year, how much will the condo be worth iin five years when the Sawyers are ready to move? Steps please.

147. ## Calculus

A force of 70 N acts at an angle of 40 degrees to the horizontal and a force of 125 N acts at an angle of 65 degrees to the horizontal. Calculate the magnitude and direction of the resultant and the equilibrant.

148. ## Math

A rectangle has one side of 3 feet and a diagonal of 3.28 ft. What is the area of the rectangle? No Pythagorean Theorem.

149. ## stats. plz help i have exams in two days!

find the indicated prob.: the amount of snowfall falling in a certain mountain range is normally distributed with a mean of 86 inches, and a standard deviation of 12 inches. what is the probability that the mean annual snowfall during 36 randomly picked

150. ## macroeconomics

When the market price is above equilibrium price, the market price will be drive

151. ## Pre-Algebra

what is the solution for this problem? 1 + 1/1+ 1/x-1/1/1 – 1/x+1

152. ## stats

a study of the amount of time it takes a mechanic to rebuild the transmission of a 1992 chevrolet cavalier shows that the mean is 8.4 hours and the standard deviation is 1.8 hours. if 40 mechanics are randomly selected, find the probability that their mean

153. ## chemistry

Under what conditions might a chemist describe a solution in terms of molality? Why??

154. ## economics

When demand falls and supply remains the same, equilibrium price _______ and equilibrium quantity ________. A) falls, falls B) rises, rises C) falls, rises D) rises, falls

155. ## Alg

AM frequencies of radio transmissions range from 535-1705 kilohertz. Assume they are an exponential function. Write an equation for the AM frequencies along a display that is 15 cm long.

156. ## Math please plaese helpppp

how do you solve this system algebraicly a- 2/3b =4 3/5a +b=15

157. ## math

what is a polynomial with a single root at x=-5 and a triple root at x=3

158. ## algebra 2

A rental car agency charges \$13 per day plus 12 cents per mile to rent a certain car. Another agency charges \$18 per day plus 8 cents per mile to rent the same car. How many miles per day will have to be driven for the cost of a car form the second agency?

159. ## biology

A rare allele may become common in the gene pool of a small population after only a few generations by the process of________________.?

160. ## math

\$2700 at 9% interest compounded quarterlyfor 4 years

161. ## chemistry

Why are the published values of the boiling points of substances always taken at 1 atm?

162. ## Math

4y^2-y^2/y-2x x^2-4/X^2+3x+2 could someone help me. Please I must turn this in tongiht.

163. ## math

4y^2-y^2/y-2x

164. ## chemistry

under water where the temperature is 17c and the pressure is 394kpa,a diver inhales 1L of air from his scuba tank how many moles of gas are in his lungs?

165. ## Calculus

A box is dragged with a force of 115 N up a ramp a distance of 3 m. If the force makes an angle of 35 degrees with the ramp and the ramp makes an angle of 20 degrees with the ground, how much work is done?

166. ## Physics

What is the acceleration of the upper block? The coefficient of kinetic friction between the lower block and upper block is 0.0005. The coefficient of kinetic friction between lower block and floor is 0.0001. Upper block is 1kg, lower block is 2kg, and

167. ## PHYSICS

A train starts from rest and accelerates uniformly, until it has traveled 3 km and acquired a velocity of 20 m/s The train then moves at a constant velocity of 20 for 400 s. The train then slows down uniformly at 0.065 m/s2 until it is brought to a halt.

168. ## chemistry

Why are the published values of the boiling points of substances always taken at 1 atm?

169. ## MATH ANALYSIS

How do you simplify these questions?: 1. cos^2(x/2)-sin^2(x/2) 2. 2cos^2(3A)-1 3. sin 2x/1+cos2x I think number 3 is tan 2x? The other two I don't know. Thanks for the help

170. ## College Chemistry

For my homework I got this problem that my professor never went over in class how to do it and I don't know how to interpret it. A chemist runs a second order reaction of A->B starting at 10mili moles/L concentration of A (and no B). After one hour the